diff --git a/github_issue_summarization/requirements.txt b/github_issue_summarization/requirements.txt
index 8440ddbd..f99bddd5 100644
--- a/github_issue_summarization/requirements.txt
+++ b/github_issue_summarization/requirements.txt
@@ -92,7 +92,7 @@ ktext==0.27
 lazy-object-proxy==1.3.1
 llvmlite==0.20.0
 locket==0.2.0
-lxml==3.8.0
+lxml==4.6.5
 Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==2.1.0